Indicator



L. H. DAVIS INDICATOR Jan. 18, 1938.

2 Sheets-Sheet l Filed NOV. 30, 1936 Snuentor Gttorneg Jan. 18, 1938. LH DAV|$ 2,105,639

INDICATOR Filed Nov. 30, 1936 2 Sheets-Sheet 2 Am. AM'T'R Am Pouce BUCRAFT 206 CRAFT SH ORT WAVE sT NDARD ya 55 2?@ 180 P RoAcAsT X926 55 manma 12u MU 'Hull 904 Kaw @'25 l 3261, y, @55 3f f- .l if) s A aj/f@ y 5,?5 ze nnen or www] l Y' BB Leah/'.9 Hava',

M Gttorneg may be supplied through a suitable transformer 62 to oneterminal of which the common return wire 58 for all of the lamps isconnected.Y The other terminal 60 of the secondary winding oftransformer 62 is connected to the switch arm 5S, so that when shaft 50is moved to change the frequency range orvband of the receiver, arm 54will complete the circuit to one or the other of these pairs of lamps,as determined'by the particular frequency range selected.

The mechanism for rotating the' tuning shaft IEI (and hence thefrequency indicating pencil of light formed by lamp and slit 34a or lamp42 and slit 34e) may be of any suitable or convenienttype. Thus,asshownin Fig. 2, a tuning con-V trol shaft lil, which will be understood toextend through the front panel of the set, and which is supported as bya bracket 12 affixed to chassis l2, carries a bi-part spool 14 whichgrips the periphery of the disc 34 upon which lamps 40 and 42 arecarried. Torque applied to control shaft 10 will be transferred throughspool 14 and disc 34 to the main tuning shaft I0 which, in rotating,varies the frequency of the tuning element C in a known manner.

The visual indication provided by the pencil of light Vupon thesubstantially rectangular scales of the drawings is quite different fromthat produced by a pointer traveling about va circular scale. Thisdifference may be attributed invpart to the fact that the axisofrotation of the pointer inVV the instant case is hidden from theobserver so that the pencil of light in its travel appears to oat up andacross Vand down the scale and tokchangeits length (fo-r instance, atthe corners of the rectangle) Wherever this, is necessary to completelyspan the surface of the scale.A

kWhile theV invention has been described as embodied in a radio receiverhaving but twoY fre# quency ranges, it is to be understood that theinvention is not limited to such application, asY

the disclosure in this respect is merely illustrative for the purpose ofexplaining the inventive concept. f Y y What isclaimed is: l. In lmulti-range radio apparatus having means for changing the frequencyrange of said apparatus, a surface having a plurality of discrete scalesthereon, each'of said scales representing one frequency range of'saidapparatus, means responsive Yto lthe operation of said range changemeans for illuminating a selected one of said scales andfor producing afrequency-indicating pencil of light upon said selected one of `Vsaidscales, andmeans formoving said pencil ofV tion of said range changemeans for illuminating Y a selected one of said scales and for producinga frequency-indicating pencil of light of distinctive color upon saidselected one of said scales, and means for moving said pencil of lightabout the said selectedscale.

3. In multi-range radio apparatus having means for changing thefrequency range of said apparatus, an opaque surface having a pluralityofk discrete, distinctively colored, translucent scales thereon, each ofsaid scales representing one frequency range of said apparatus, meansresponsive to the operation of said range Vchange means for illuminatinga selected one of said scales and Yfor producinga correspondinglycolored frequency-indicating'pencil of light upon said selected one ofsaid scales and means for moving said colored Vpencil of light abouttheV said selected scale.

4. In multi-range radiol apparatus having means for changing thefrequency range of said apparatus, a continuous surface constituted by aplurality of scale-bearing members joined Vin cdge-to-edge relation withanrinterposed layer of opaque material therebetween, the number of rsaiddiscrete scale-bearing members correspond` ing to the number of separatebands to which said apparatus may be tuned,Y means disposed adjacent'anledge offsaid surface forV illuminating a selected one of saidVscale-bearing members, means for producing a frequency yindicatingpointer of light upon said selected one of said scale-bearing members,`said. edge-illuminating Y means and said frequency-indicating pointerbeing responsive to the operation 'of said range change means, and meansfor moving said pointer of light about said selected oneA of saidscales.

5. In` multi-range radio apparatus `having means for changing thefrequency range of said apparatus, an opaque surface having a pluralityof discrete translucent scale areas thereon, each of said scale areasrepresenting one frequency range of said radio apparatus, aV mask in theform of adisc mounted for movement about a central axis in the rear ofsaid opaque'surface, said masks being provided with a plurality ofelongated slits individual to'saidY Ascale areas, lamps individual toVsaid slits mounted behind said mask, means connected to said `rangechange means for selectively illuminating said lamps whereby to projecta frequency-indicating pencil of light upon a selected one of said scaleareas and means for moving said mask and hence said pencil of, lightabout the selected scale area. v

6. In Ymulti-range 4radio vapparatus having means for changing thefrequency range of saidV apparatus, an opaque surface having a pluralityof discrete translucent scale areas thereon, each of said scale areasVrepresenting one-frequency range of said radio apparatus, a mask in theform of a disc mounted for movement about a central axis in the rear ofYsaid opaque surface,

said mask being provided with aV plurality Vof elongated yslits'individual to said scale areas, a second mask'mounted behind saidfirst-mentioned mask and for movement therewith, a plurality of lampsmounted on said` second mask in line with said respective slits, meansconnected to said range change means for selectively illuminating saidlamps whereby tor project a frequency-indicating pencil of lightupon aselected one of saidtranslucent scale areas, and means for moving saidYmasks and hence said pencil of light about the selected scale area.

LEWIS H. Davis.` i

